<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>demo</title>
    <script type="text/javascript" src="../vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="forceUpdate">强制更新</button>
        <button @click="s1">修改数组的某一个值</button>
        <button @click="s2">使用变更方法修改数组</button>
        <button @click="s3">使用非变更方法修改数组</button>
        <h1>{{count}}</h1>

        <ul>
            <li v-for="item in names">{{item}}</li>
        </ul>

    </div>
</body>
<script type="text/javascript">
    Vue.config.productionTip = false
    const vm = new Vue({
        el: "#app",
        data() {
            return {
                count: 0,
                names: ["lily", "wucy", "zhangsan","lis1"]
            }
        },

        methods: {
            forceUpdate() {
                this.$forceUpdate()
            },

            s1() {
                /* js的限制,无法检测数组中某个值的变化,所以直接修改数组视图不会更新 */
                // this.names[1] = "libo";
                this.names.length = 0;
            },

            s2() {
                console.log(1);
                /* Vue 将被侦听的数组的变更方法进行了包裹，所以它们也将会触发视图更新 */
                // this.names.push("huge")
                  this.names.sort()
                // count++
            },
            s3() {
          this.names = this.names.filter(item => {
            return item !== "lily"
          })
        }
        }
    })
</script>

</html>